DiscoStudd Posted January 25, 2007 Report Share Posted January 25, 2007 (Mods: This topic comes up quite often. Please move to the FAQ section) Most Auto-Trans equipped 1st Generation W-Bodies have a large hole cut through the firewall between the driver's side strut tower and the brake master cylinder. The hole is plugged with a rubber grommet which can be easily drilled out to allow you to pass your amp wires through. The reason for the giant hole in the firewall? Simple. It's where the clutch master cylinder is mounted on the W-Bodies that received Manual Transmissions. Link to comment Share on other sites More sharing options...
slick Posted January 25, 2007 Report Share Posted January 25, 2007 For manual equipped w's, use a 1/8" to 3/4" step drill bit, find the brake or clutch master cylinder on the inside firewall, then about 5-6" below that, drill a hole, and use a grommet to prevent the insulation from being cut. Link to comment Share on other sites More sharing options...
19Cutlass94 Posted January 25, 2007 Report Share Posted January 25, 2007 For manual equipped w's, use a 1/8" to 3/4" step drill bit, find the brake or clutch master cylinder on the inside firewall, then about 5-6" below that, drill a hole, and use a grommet to prevent the insulation from being cut. Also, most people will want to drill the hole bigger than what is needed or else it would be a bitch to get the wire through the grommet, but on top of this, I would also find some sort of foam, of insulation, or even the factory sound deadening to make a "shield" on the interior side of the firewall. Link to comment Share on other sites More sharing options...
synistershadows Posted January 13, 2008 Report Share Posted January 13, 2008 ok i do have another topic going so lock this is you so wish but the location indicated in the pic i have a 3.4 international car and there seem to be alot more activity in that location any sugesstions as to how i might work around that or another location? Link to comment Share on other sites More sharing options...
slick Posted January 13, 2008 Report Share Posted January 13, 2008 All W's have the same amount of space. Had you had a 5speed equipped vehicle, I could understand the concern with lack of space. Link to comment Share on other sites More sharing options...
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